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<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br />i <br /> <br /> <br /> <br /> <br /> <br />1 <br />1 <br />The stability analyses and typical sections are discussed <br />in detail in Section D.3.5. Detailed information on <br />construction requirements is included in ttie Technical <br />Specifications as part of Appendix N. <br />D.3.4.2 Waste Rock Disoosal Area Construction Sequence <br />The East Pit is the first area planned for mining. Waste <br />rock from the East Pit areas will be hauled to waste rock <br />disposal area C or the southern waste rock disposal area for <br />disposal. Mining will be completed in the East Pit within the <br />first several years of operation, and some waste rock from the <br />West Pit will be used to partially backfill the East Pit. The <br />remaining waste rock will be hauled to either the southern <br />disposal area or the northern disposal areas. Once mining <br />commences in the West Pit, waste rock disposal will also occur <br />concurrently in both the southern disposal area and the <br />northern disposal areas. <br />Initially, the south waste rock/tailings d~sposal area <br />will be developed using a different facility configuration than <br />that used at the north waste rock disposal areas. The north <br />disposal areas will generally be constructed from bottom to <br />top, starting each 50-ft high lift on the one below it. At the <br />south waste rock disposal area, initial~y 1,000,000 tons of <br />waste rock or locally available native soils will be used ±o <br />construct a 120-ft wide, maximum 50-ft high starter berm with <br />sideslopes at angle of repose. Additional waste rock and <br />dewatered tailings will then be transported by truck along the <br />top of the starter berm for disposal by end dumping along the <br />berm perimeter. The berm will allow for dewatered tailings <br />disposal on the south side and additional waste rock disposal <br />on either the north and south sides. The initial facility is <br />estimated to have sufficient volume to store 8 to 10 months <br />of tailings production if disposed with waste rock in a 1:1 <br />ratio. As the initial combined tailings and waste rock disposal <br />D-22 <br />